According to the law of conservation of energy in thermodynamics: Any form of energy conversion requires a loss. An electric fan converts electrical energy into wind kinetic energy, but how much energy is lost? It is thermal energy. The back of the electric fan will know after use. Additionally, the wind with kinetic energy will bounce off obstacles (the air flow field will change. If the entire room is a system with only electrical energy input but no input, the wind will also circulate air. Temperature increases, but it increases very slowly Mechanical energy will eventually turn into thermal energy).
When electrical. the fan works, it converts electrical energy into kinetic energy and thermal energy.
1. The principle of an electric fan is that the energized coil is forced to rotate in the magnetic field.e. The form of energy conversion is: electrical energy is mainly converted into mechanical energy. At the same time, because the coil has resistance, it is inevitable that part of the electrical energy will be converted into thermal energy. The most important piece of hardware in an electric fan is the motor. Only when the engine is running can the fan blades rotate.
2. The electric fan relies on the motor to operate the fan blades. The reason why electric fans can blow air continuously is because the fan blades are at a certain angle. When the motor drives the fan blades to rotate, the fan blades will encounter air resistance, because the fan blade angle is much less than 90 degrees. , the air will push axially forward.
3. Fan blade shape selection: fan bladeseur become finer and finer when the fan speed is high and the power is high. High-power electric fans all adopt a slender blade shape. After the electric fan is powered on, the positive and negative alternating current generates a magnetic field, which makes the energized coil of the motor rotate under the force, and the rotating shaft and fan blades rotate, converting electrical energy into mechanical energy. During the energy conversion process, part of the energy is converted into thermal energy and transferred to the outside, thereby releasing heat.
4. We use electric fans to cool, not because the electric fan itself can cool. Not only does it not cool, the electric fan will also increase the heat due to energy conversion. An electric fan can cool you downchir. But when people are hot, they expel sweat outward. The fan accelerates airflow to promote sweat evaporation and absorbs body heat to achieve cooling.